package cn.zhou.controller;

import cn.zhou.entity.CommonResult;
import cn.zhou.entity.Payment;
import cn.zhou.lb.LoadBalancer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

/**
 * @Description:
 * @Author: zhou
 * @Date: Create in 14:47 2020/7/20
 */
@RestController
@Slf4j
public class OlderController {

    @Resource
    private RestTemplate restTemplate;

    @Resource
    private LoadBalancer loadBalancer;
    @Resource
    private DiscoveryClient discoveryClient;
    //单机版
    //public static final String PAYMENT_URL="http://localhost:8001";
    public static final String PAYMENT_URL="http://CLOUD-PAYMENT-SERVICE";

    @GetMapping("/consumer/payment/create")
    public CommonResult<Payment> create(Payment payment){
        return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommonResult.class);
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> get(@PathVariable("id") Long id){
        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
    }

    /**
     * 测试getForEntity
     * @return
     */
    @GetMapping("/consumer/payment/getForEntity/{id}")
    public CommonResult<Payment> getPayment2(@PathVariable("id") Long id){
        ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PAYMENT_URL + "/payment/get/" + id, CommonResult.class);

        if(entity.getStatusCode().is2xxSuccessful()){
            log.info(entity.getHeaders() + "\t" +entity.getStatusCode());
            return entity.getBody();
        }else{
            return new CommonResult<>(444, "操作失败");
        }
    }

    /**
     * 测试我们自己的轮询算法
     * @return
     */
    @GetMapping(value = "/consumer/payment/lb")
    public String getPaymentLoadBalancer(){

        List<String> services = discoveryClient.getServices();
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");

        if(instances == null || instances.size() <= 0){
            return null;
        }

        ServiceInstance serviceInstance = loadBalancer.instances(instances);
        URI uri = serviceInstance.getUri();

        return restTemplate.getForObject(uri+"/payment/lb", String.class);
    }

}
